Expansible pulley.



lPATENTBD AUG. 30, 1904.

P.H.SHUB. BXPANSIBLE PULLEY. APPLIOATION FILED NOV. Q 1903.

2- BHBBTS-SHEET-l.

v:N0 MODEL.

` 'IIIIHIIIIIIIIIIIIHII No. 769,117.- I

PATENTED AUG.v 30, 1904.

P. H. SHUE.

EXPANSIBLE PULLEY.

APPLIOATION FILED Home, 190s.

2 SHEETS- SHEET 2.

N0 MODEL.

Wittmann v l ing description and the accompanying draw- UNITEDV STATES Patented August 30, 1904.

PHILIP H. SHUE, AOF DENVER, COLORADO.

EXPNSIBLE PULLEY.

SPECIFICATION forming part of Letters Patent No. 769,117, dated August 30, 1904.

Application filed November 9,1903. Serial NO- 180,333- (NO DlOdel- To all 'wh/0m, t may concern:

Beit known that I, PHILIP H. SHUE, a citizen of the United States, residing at Denver, in the county of Arapahoe and State of Colorado, have invented new and useful Improvements in Expansible Pulleys, of which the following is a specification.

This invention relates particularly to expansible pulleys in which the expansion of rimsegments is produced by the use of disks having a spiral groove, and more particularly to improvements' in my Patent No. 718,800, issued January 20, 1903.

The object of the invention is to improve the construction of such pulleys, especially with respect to the adj usting-rings, which control the movement of the segments, and consequently the size of the pulley. The construction herein shown has a friction-clutch permitting gradual starting and stopping of the adjusting-rings instead of the positive action as shown in said patent. Improvement is also shown and claimed with respect to the construction of the pulley-frame, permitting a greater degree of contraction.

A further object isl to produce positive guides for the stems of the segments, so that they will remain in absolute alinement to prevent binding.

'Various other improvements in details Vof. construction will be apparent from the followings.

In the drawings, Figure 1 1s a central sec- .tionof the pulley lengthwise of the` shaft.

Fig. 2 is a similar section'in a different plane. Fig. 3 is a half elevation and transverse sec-` tion, and Fig. 4C is a detail in perspective showing 'oneof the bearing-blocks which is carried by a pin on the inner end of the stems of the rim segments and whichk llt in the grooves. l

' Referring specilically to the drawings, the main shaft is indicated at 6. The pulley-frame is formed of two split side sections 7 ,the hubs 8 of which meet at the middle of the pulley when the parts are assembled. Said hubs are extended outwardly, as at 9, to form a` bearing for the adj usting-rings 10 thereon. rlhese rings are split and the halves joined together in any suitable manner, and each has on the inner face thereof a spiral or Worm gear 10E. Springs 11, in compression between the hub of the rings-and the flange 9, tend to keep the rings in gear with the pinion 12, the shaft 12 of which linds its bearings on the frame 7 and carries at its outer endI a bevel-gear 111, in mesh with a corresponding gear 14, the shaft 15l of which extends through bearings in the side plate of the pulley and carries a pinion 15, meshing with an internal gear 16, produced in the rim of the adjusting-disks 17. These disks are split, as indicated in my former patent, and have on the inner faces thereofspiral grooves 171. The disks 17 are rotatable on the hub of the frame, and the hubs of the disks meet at the middle line of the pulley and are joined -by welltting dowel-pins 17h. The hub of the main frame is cored Alengthwise to receive a spacing-rod 18, which extends between the hubs of the adjusting rings, and has for its purpose to space the adjusting-rings apart, so that they move simultaneously, and when one is in full gear with its pinion 12 the other is out of gear, and

the springs 11 are balanced, so that normally both adjusting-rings are in gear with the pinions and any action thereof is counteracted.

To the rim of each of the side sections 7 an a segmental bearing-block 22h, the surfaces of which are properly curved to conform closely to the sides of the groove. The purpose of this is to avoid any looseness or play of the segments. The blocks 22b are loosely litted on the pins, so that they conform without binding friction to the'grooves. They also serve to give amore lirm support to the seg` ments to resist the radial thrust thereon.

For the purpose of positively guiding the IOO stems and keeping them in exact radial alinement spacing-plates 23 are provided. rIhese plates are fitted between the rims of the frames 7 and have lugs 23a on the sides which it into depressions communicating with the tapped holes for the cap-screws 20, so that when the screws are tightened their points bear against the lugs and assist in holding the plates in position. Each plate has a hole at the middle through which the ste-m 22 works at a close flt. This keeps the stem in alinement and prevents any distortion or binding incident to the tangential pull on the segments. To further assist in holding the plates 23 in position and to guide the stems, inner segmental guides 24 are employed. Each of these consists of a casting having end surfaces 24, between which are spaces disposed in radial alinement with respect to the wheel. The said surfaces are in guiding contact with the stems 22. These pieces are fastened to the plates 23 by screws, as at 24h, and are located between the' adjusting-disks 17. It will be seen that in connection with said plates they make a complete ring around the pulley of suiiicient body and strength to support the tangential strain and to form rigid guides for the radial movement of the stems. rI he levers to shift the adjusting-ring are shown at 25 suitably bowed over the shaft and pivoted at some fixed point in a manner common to this class of levers. Each carries clamps .26 and 27, the latter of which is controlled by a hand-latch 28 to throw the clamp into or out of engagement with the rim of the adjustingrings 10.

In operation the springs 11 keep both adjusting-rings partially in contact with the shifting gear, and thereby the pulley must remain constant, as one side opposes the other, and the pulley cannot fcrawl or shift itself in the slightest. To change the diameter of y the pulley, the lever 25 is pressed against the rim of the ring, which throws the gear of the ring in full engagement with the pinion 12, and by means of the spacing-rod 18 the adjusting-ring on the other side is thrown out of gear. The clamp is then applied to the rim of the adjusting-ring by means of the hand-latch, eifecting a friction-clutch which gradually stops the movement thereof. The continued revolution of the pulley causes the rotation of the pinion 12 by its engagement in the worm-gear 10 and accordingly turns the adjusting-disks 17, which draws the pulley-segments in or out, according to the direction of rotation.

The above description indicates the preferable embodiment in a split pulley; but it is obvious that the same invention may be used in connection with a solid pulley, and the scope of the invention is not limited to the specific construction set forth, nor otherwise than is indicated in the following claims.

vWhat I claim as new, and desire to secure by Letters Patent, is-

1. The combination with a pulley-frame having radially guided movable rim segments, of oppositely-operating expansion devices on each side of the frame, and a connection between said devices constructed to disvspacing-rod extending between the rings and through the pulley.

4. The combination with a pulley having an expansible segmental rim, of adjustingrings on opposite sides of the hub of the pulley and geared to the segments, springs bearing against the rings and tending to keep both in partial gear, and a rod extending through the hub between the rings, spacing the same apart, so that when one is thrown in full gear the other is thrown out of gear.

5. The combination with the frame, andthe spirally-grooved expansion-disks therein, of the rim-segments having stems extending between the disks,the radial guides on the frame for the stems and the movable bearing-blocks carried by the stem, in the grooves.

6. The combination with the frame, and the spirally grooved expansion-disks therein, of the radially movable rim segments having stems with projections engaging the grooves, and guides for the stems, supported on the frame.

7. The combination with the frame, and the spirally-grooved expansion-disks therein, of the radially movable rim segments having stems with projections engaging the grooves, and the segments fixed to the frame, between the stems and having radial guides therefor.

In testimony whereof I have signed my name to this specification in the presence of two suhscribing witnesses.

PHILIP H. SHUE.

lVitnesses:

MILTON SMITH, THOMAS F. DILLoN, Jr.

IOO 

